Pressure live loads and the variational derivation of linear elasticity

The rigorous derivation of linear elasticity from finite elasticity by means of gamma-convergence is a well-known result, which has been extended to different models also beyond the elastic regime. However, in these results the applied forces are usually assumed to be dead loads, that is, their density in the reference configuration is independent of the actual deformation. In this paper we begin a study of the variational derivation of linear elasticity in the presence of live loads. We consider a pure traction problem for a nonlinearly elastic body subject to a pressure live load and we compute its linearization for small pressure by gamma-convergence. We allow for a weakly coercive elastic energy density and we prove strong convergence of minimizers.